chore(deps): update flake.lock (#4770)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d333699' (2026-07-02)
  → 'github:NixOS/nixpkgs/716c7a2' (2026-07-11)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/fe5aee0' (2026-07-04)
  → 'github:oxalica/rust-overlay/a286e5b' (2026-07-12)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1782978903,
-        "narHash": "sha256-bG1LAS3YehMzp4RSXw99o3yMEO/Ktb0Tx29RCtEU0Tk=",
+        "lastModified": 1783791668,
+        "narHash": "sha256-zbcZ1dmBTPfJ7Mlqh/yLEPGpgJnwuv4Xr1xucy2WqMA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d33369954a67ae3322177dc9a3d564092912120c",
+        "rev": "716c7a2664ca8325617b8a7fbb609273f2c4cae7",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1783144302,
-        "narHash": "sha256-NQnzmXwpEAd5tjMBh2+P/y9NknF+WHv5+6yoXoN4h/Y=",
+        "lastModified": 1783834461,
+        "narHash": "sha256-FCmrs1StAghJDKfqy56KM96KZtxpYzgeq6zM3QO8wjA=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "fe5aee0952e8e1525533d61defd9e36513db811b",
+        "rev": "a286e5b998e852297a403786f063fb2c9fe7f57a",
         "type": "github"
       },
       "original": {